title: N,N'-Bis(4-hy-droxy-phen-yl)pyridine-2,6-dicarboxamide di-methyl-formamide monosolvate.
abstract: The mol-ecular structure of the pyridine derivative, C19H15N3O4·C3H7NO, shows almost planar geometry with dihedral angles of 6.9 (1) and 13.4 (1)° between the pyridine ring and the two benzene rings. This conformation is stabilized by two intra-molecular N-H⋯N(pyridine) bonds. In the crystal, strong O-H⋯O(carboxamide) and N-H⋯O(hy-droxy-phen-yl) hydrogen bonds link the mol-ecules, forming a three-dimensional structure. The di-methyl-formamide solvent mol-ecules are not involved in the hydrogen bonding. The structure shows pseudosymmetry, but refinement in the space group Pbcn leads to significantly worse results and a disordered di-methyl-formamide mol-ecule.
authors.affiliation: Department of Chemistry, Quaid-I-Azam University, Islamabad 45320, Pakistan.
authors.forename: Ghulam
authors.initials: G
authors.lastname: Waris
authors.forename: Humaira Masood
authors.initials: HM
authors.lastname: Siddiqi
authors.forename: Ulrich
authors.initials: U
authors.lastname: Flörke
authors.forename: Rizwan
authors.initials: R
authors.lastname: Hussain
authors.forename: M Saeed
authors.initials: MS
authors.lastname: Butt